style: move all php libs to a folder

The php lib files are in the app directory root. Move it to a new directory so that can be tidy.

uoj/1/app/cli.php

@@ -2,7 +2,7 @@
 
 $_SERVER['DOCUMENT_ROOT'] = dirname(__DIR__);
 
-require $_SERVER['DOCUMENT_ROOT'] . '/app/uoj-lib.php';
+require $_SERVER['DOCUMENT_ROOT'] . '/app/libs/uoj-lib.php';
 
 // TODO: more beautiful argv parser
 

uoj/1/app/libs/uoj-lib.php

@@ -10,7 +10,7 @@
 		$REQUIRE_LIB[$name] = '';
 	}
 	function requirePHPLib($name) { // uoj php lib
-		require $_SERVER['DOCUMENT_ROOT'].'/app/uoj-'.$name.'-lib.php';
+		require $_SERVER['DOCUMENT_ROOT'].'/app/libs/uoj-'.$name.'-lib.php';
 	}
 	
 	requirePHPLib('validate');

uoj/1/index.php

@@ -2,7 +2,7 @@
 
 Session_Start();
 
-require $_SERVER['DOCUMENT_ROOT'] . '/app/uoj-lib.php';
+require $_SERVER['DOCUMENT_ROOT'] . '/app/libs/uoj-lib.php';
 
 require UOJContext::documentRoot().'/app/route.php';
 require UOJContext::documentRoot().'/app/controllers/subdomain/blog/route.php';